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add and subtract fractions

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  • 1/5 + 2/5 =
    3/5
  • 4/5 - 1/ 5
    3/ / 5
  • 6/7 - 3/7
    3/7
  • 4 / 7 + 2 / 7
    6/7
  • 2 / 9 + 5 / 9 = ?
    7 / 9
  • 3/ 6 - 1/ 6 = ?
    2/6
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